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If you're incredibly desperate you could try this...there might be a much quicker way though!

Set up a VNC server on the machine you want to get the screenshot from and connect to it from another machine. You could take the screenshot on the other computer if you got someone else to hold down Alt+Tab for you

What about something like CamStudio, (http://camstudio.org/), take a movie of the screen, then grab a screen shot of the movie? I've never tried this particular product, but it sounds like it might do the trick.